Samuel scott wilson



Jan. 5 1926. Re. 16.241

5. SQ WILSON I APPARATUS FOR MANUFACTURING SHEETS AND THER ARTICLES FROM PLASTIC MATERIALS- Original Filed 7, 1923 5a mat? 30 oil WZZSQI'L A TTUR/VEV Reissuea Jan. 5, 19 26. I

UNITED STATES PATENT OFFICE.

smear. scor'r wILsou, or'MnYnn-roir, rnansvaar, scorn ma APPARATUS FOR MANUFACTURING SHEETS AND OTHER ARTICLES FROM: PLASTIC uA'rnnIALs.

Original no. 1,520,781, dated December 30, 1924, Serial No. 679,248, filed December .7,

' for reissue filed August 7, 1925. Serial No. 48,905.

To all whom it may concern:

Be it known that I, SAMUEL son, a subject of the King of Great Britain, and resident of Meyerton. Transvaal Province, Union of South Africa, have invented a certain new and useful Improvement in Apparatus for Manufacturing Sheets and Other Articles from Plastic Materials, of which the following is a specification.-

This invention relates to the manufacture of sheets, tiles, and the like applicable forbuilding and other similar purposes, which are made from plastic cementitious mixtures or materials such as asbestos and cement, or from a cementitious mixture in which the asbestos is the principal constituent by bulk or volume.

Although primarily designed for the manufacture of sheets and like fiat products, the invention can also be adapted to the manufacture or production of articles or prodnets of other shape or configuration from such materials.

In one method of manufacturing sheets,

etcetera, from a mixture of asbestos, Port-- land cement and water, the mixtureis spread on a table, slab or mould'ma-de from mate'- rial which has a high absorptive capacity for water, such as plaster of Paris.

The present improvements appe'rtain to an apparatus in which such a slab, tablelor mould is employed. and have for one object to combine therewith heating means which will facilitate the process of manufacture by ensuring a quicker drying of the material after it has been spread or applied to the surface of the slab, table or mould. An-

1 other object is to prevent the cement or equivalent ingredient of the mixture from 'comin face 0 the orous slab, table or mould, so as to maintain the maximum absorptive ca pacity. A further object is to construct the apparatus in such a way that/the slab, etcetera, can be used practically continuously, by utilizing both sides thereof, and to that end providing means whereby it can be readily inverted. A still further object is to construct and arrange the various arts of the apparatus to simplisy and faci itate production and thereby r uce the cost of manufacture of the sheets, aid" thereof. i

As a result of the rapid formation and directly into contact with the suretcetera, with the p 1923. Application 7 drying of the sheets, etcetera, a. mixture con- Soorr W11 talning a higher percentage of asbestos can be used than with the-existing slabs and1 in that 'way a lighter sheet can be made.

7 The invention will be -more particularly explained in connection with the accompanying drawings, wherein.--

Fig. 1 is a part-sectionalside elevation of the apparatus designed for use in the production oi sheets.

gig, 2 is a part-sectional plan of the same, an

i Fig. 3 is a plan view, drawn to a reducedscale, of the carrier and support for retaining the sheet on the slab orthe like while the latter is being inverted, and for subsequently removing it therefrom.

In the drawings thenumeral 1 denotes the slab, table or mould which is made of plaster of Paris, or other similar material or mixture of high absorptive capacity for water. The slab, etc etera, 1 is made of appropriate dimensions and is carried in a metal framework shown comprising thetwo rectangular angle iron frames 2, 3, the ends of which are each connected by means of a;

strap or plate 4'-see Fig. 2. To the frame 2, 3, at opposite sides thereof, are bolted or otherwise suitably fixed plates 5, 6, to which, in turn, the flanges 7 8, are attached. Into each of the flanges or sockets 7, 8, there'is screwed orotherwise suitably fixed a tubular member, 9, 10, respectively, which serves as hollow trunnions by which the slab, etcetera, is rotatably supported; 11, 12, being the hearings in which the trunnions are journalled, and 13. 14, the pedestals or founder tions' upon which the bearings 11, 12 are arranged at a suitable working height.

For the purpose of heating the slab, etcetera, a pipe 15, shaped into the form of a flattened coil or a double zig-zag structure is embedded therein, and one end, 16, of the pipe 15, 0 us into the one hollow trunnion 9, whilst t e other, 17 opens into the other hollow trunnion 10. The ends 16, 17, of the pipe 15 may be fixed in the lates 5, 6, respectively, by the nuts 18, 19. e hollow trunnion 9 may serve as the inlet to the flattened coil 15 and the other hollow trunnion 10 serve as the outlet. The steam or hot fluid supply pipe 20 passes throu h a stufl'e ing box and gland 21 into the be low trunmon 9; 22 being a nut for preventing witha sheet of paper 39 or other suitable material which, while readily admitting of the pas-.

gland 24 being of the same construction as gland 21.

In order to support and steady theslab, etcetera, 1 in its normal horizontal position,

which is the position in which it is placed when forming a sheet, etcetera, thereon, movable wedge-shaped rests or stops 25, 26, placed at opposite sides of the slab, are provided. These rests 25, 26, are shown arranged in guides 2?, 28, fixed on the foundations 13, 14, at opposite sides of the bearings 11, 12. The rests or stops 25, 26, are withdrawn from their guides 27, 28, when it is desired to invert the slab, etcetera, 1, as hereinafter explained.

' In order to impart the desired shape to the sheet, etcetera, and determine its thickness, a loose removable metal frame is employed, which is made of a size and she e to correspond to thesheet, etcetera, to be formed upon the slab, etcetera, 1. This frame is shown comprising two rigid side members 29, 30, and two thinner and flexible end members 31, 32, which members are shown connected together at the corners by 1 k means of plates 33 riveted to the members 29, 30, 31, 32. Between the members 29, 30, and 31, 32, at the corners of the frame, there are placed small pieces 34 which are of the same thickness as the members 29, 30. 35 are the rivets fixing plates 33 to the various members 29, 30, 31, 32, 34 of the frame.

Separate removable rigid members 46, 47 are shown placed at the ends of the frame, parallel to the members31, 32 and next the inner ends of the small pieces 34, so that said pieces 34 serve as stops for the members 36, 37 in the direction of the ends of the frame. The thickness of the members 29, 30, and 36, 37, determines the thickness of the sheet, etcetera, which is made in the frame,

and the size of the sheet, etcetera, is equal to the area of the space enclosed between the inner edges of said members. This construction of the frame facilitates the operation of removing the frame after the sheet, etcetera has been formed, and the subsequent-removal of the sheet from the slab or table.

The upper surface of the slab or tablel is.

completely covered with a piece of jute canvas 36, or other suitable canvas or woven material of a suitable texture, and u on said canvas covering 38, there is prefera ly laid sage through it of water, will prevent the passage through it of the fine solid material or the cement of the mixture. The frame in which the sheet, etcetera, is made or moulded is placed directly upon the paper coverin pensed with and the table 1 covered with a piece of coarse woven fabric, uch as hessian, to which a thin layer of a mixture of French chalk and plaster of Paris is applied, the piece of jute canvas or the like being placed upon said hessian or the like.

The material from which the sheet is to be made is more or less roughly spread upon the surface of the paper 39, inside the frame, and it is then formed into an even layer or thickness by suitable means, as for example, by means of a suitab e heavy roller 40, comprising an outer metal pipe or tube filled with concrete or other suitable weighty material 41, and closed at the ends with cover plates 42. The roller is provided with a central rod 43 which serves as a handle at each end projecting beyond the sides of the frame of the slab or table. The roller near its ends rests and rolls on the members 29, 30 of the frame.

After the material has 'been roughly spread on the slab or table, it is rolled level by moving the roller 40 backwards and forwards, any surplus material being thereby worked to the ends of the frame from which it can be removed in any suitable manner, as fomexample, by means of a trowel or the After the sheet has been formed, the frame comprising the members 29, 30, 31, 32, is removed, and the separate or loose members 36, 37, are then taken away. The formed sheet is now secured on the surface of the slab or table by means of a carrier and support sh0wn-see Figs. 1 and 3constructed of a suitable number of parallel members or slats 44 connected together. by a suitable number of other members 45 placed at right angles thereto. Means are provided for attaching this support and carrier to the sides of the frame of the slab or table, and for this urpose each of said sides has hingedly attac ed to it an eyebolt 46, which are adapted to engage in the bifurcated ends 47, of the central parallel member 45; 48 are wing nuts on the ends of the eye olts 46 for clamping the carrier in position over the sheet. When the slab or table isv inverted the sheet lies upon the carrier and support so that the latter serves as a convenient vehicle for transporting it to any desired plaee. The loosening of the wing nuts 48 allows the eyebolts 46 to be disengaged from the bifurcated ends 47 of the central parallel member 45, which permits the carrier, together with the sheet, to be lowered and removed.

The eyebolts 46 are pivotallymounted on g for fixing the carrier and support on either 39. Alternatively, the paper 39 may be dip face of the slab or table. By attaching the angle iron pieces 50 to the members 2, 3,

they serve to stiffen and stren hen the framework carrying the slab or ta le.

What I claim as my invention and desire heating means embedded in said table.

'2. An apparatus of the nature indicated,

including a table of absorbent material, and

heating means in the form of a flattened coil embedded in said table. 3. Anapparatus of the'nature indicated,

. including a table of absorbent material, said table being adapted to be rotated in order fto invert it.

4. An apparatus of the nature indicated, including a table of absorbent material, said table being adapted to be rotated in order to invert it, and removable rests for retaining the table in its horizontal or working position. l

5. An apparatus offthe nature indicated, including an absorptive 'table, and heating means embedded in said table, said table being adapted to. be rotated in order to invert 6. apparatus of the natureindicated, including an absorptive table, said table being adapted to be rotated in order to invert it, the means] for permitting of the table being inverted comprising trunnions rovided at opposite sides of the table and arings for said trunnions, and heating means embedded in the table. v a

7. An apparatus of the nature indicated, including a table of absorbent material, heating means in the form of a flattened coil embeded in said table, means for permitting of the table being inverted, said means comprising'trunnions provided at opposite sides of the table and bearings for said trunnions,

the trunnions being of hollow construction and communicating with the flattened coil,

and means for introducing theheating medium into one trunnion and for withdrawing said medium from the other trunnion.

8. An apparatus of the nature indicated, including a table of absorbent material,

heating means embedded in said table, said table being adapted to be rotated in order.

to invert it, and orous media arranged upon the working sur ace of said table.

9. An apparatus of the nature indicated,

including a table made of absorbent mato invert it, a carrier and support for the sheet or product, and means provided on the table for detachably securing the carrier and sup rt on either working surface of the ta e.

11. An apparatus of the nature indicated,

heatin means in the form of a flattened coil embed ed in said table, means for ting of the table being inverted, sai means comprising trunnions provided at opposite sides of. the table and bearings for said trunnions, the trunnions being of hollow construction and communicating with the flattened coil, means for introducing the heating medium into one trunnion and for withdrawing said medium from the other trunnion, porous media arranged on the working surface of the table, upon which media the material is moulded or formed, said porous media consisting of a sheet of canvas and asu erimposed sheet of pager, an appropriately s aped frame arrange upon the table, said frame being provided with flexible ends and rigid sides and separate or loose end members arranged inside said frame, a carrier or support for the sheet or product, and means provided on the table for detachably securing the carrier or support on either working surface of the table.

Signed at Johannesburg South Africa this 14 day of June. 1925. g

SAMUEL SCOTT WILSON.

including a table of absorbent material,

ermit- 3 

